Energy absorption and self-sensing performance of 3D printed CF/PEEK cellular composites

Andrew, J. J., Alhashmi, H., Schiffer, A., Kumar, S. and Deshpande, V. S. (2021) Energy absorption and self-sensing performance of 3D printed CF/PEEK cellular composites. Materials and Design, 208, 109863. (doi: 10.1016/j.matdes.2021.109863)

Abstract

We report the energy absorption and piezoresistive self-sensing performance of 3D printed discontinuous carbon fiber (CF)-reinforced polyetheretherketone (PEEK) cellular composites. Experiments conducted on three different 2D lattices with hexagonal, chiral and re-entrant topologies of the same relative density (33%) and CF loading (30 wt. %) reveal that the CF/PEEK hexagonal lattice (HL), due its relatively brittle response, shows about 40% and 9% decrease in specific energy absorption (SEA) under in-plane and out-of-plane compression, respectively, compared with PEEK HL. While the collapse response of PEEK HL is nearly insensitive to the strain-rate over 43 ≤ ≤ 106 s-1, we observe a twenty-fold increase in peak stress and a five-fold increase in SEA under in-plane impact loading over the same range of strain-rates for the CF/PEEK HL. The CF/PEEK lattices exhibit pronounced piezoresistive response under both in-plane and out-of-plane compression with maximum sensitivity of 3.1 and 5.2, respectively, for the re-entrant lattice, offering insight into the damage-state. Higher damage sensitivity indicates faster percolation of new contacts due to folds forming between the cell walls within the lattice under compression. The energy-absorbing and strain- and damage-sensing nature of 3D printed CF/PEEK lattices demonstrated here offers insight into the design of lightweight, high-performance multifunctional lattices.

• Item Type: Articles
• Additional Information: SK would like to thank the University of Glasgow for the start-up grant [award no: 144690-01]. Authors would like to acknowledge the funding provided by Khalifa University through the Competitive Internal Research Award (CIRA) [grant number: CIRA-2018-128].
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kumar, Professor Shanmugam
• Authors: Andrew, J. J., Alhashmi, H., Schiffer, A., Kumar, S., and Deshpande, V. S.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Materials and Design
• Publisher: Elsevier
• ISSN: 0261-3069
• ISSN (Online): 0264-1275
• Published Online: 01 June 2021
• Copyright Holders: Copyright © 2021 The Authors
• First Published: First published in Materials and Design 208: 109863
• Publisher Policy: Reproduced under a Creative Commons License

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